Song Practice Lab QA Checklist

Use this checklist for each release candidate before publishing downloads or website copy.

Run Metadata

Short file: import a 5-15 second MP3, WAV, and FLAC; waveform, metadata, playback, loop points, and export all work.
Long file: import a 30-60 minute file; waveform rendering remains responsive and stem jobs can be cancelled without corrupting the project.
Chinese path: open a file from a path such as 测试素材/歌曲练习/主唱.wav; project save and export preserve the path correctly.
Damaged file: import a truncated or invalid audio file; the app shows a recoverable error and does not create a broken project.
Huge file: try an oversized file near the documented memory limit; the app rejects or queues it with a clear message instead of freezing.
Unsupported file: import a text file renamed as .mp3; the app reports unsupported media cleanly.

44.1 kHz stereo file imports, plays, separates stems, loops, and exports correctly.
48 kHz stereo file keeps timing accurate after tempo changes and export.
96 kHz file either processes correctly or reports a clear downsample/unsupported message.
Mono file displays one coherent waveform and exports without channel errors.
Variable bitrate MP3 keeps loop timing stable after repeated play and seek actions.

Import -> stem separation -> solo/mute each stem -> save project.
Tempo reduction at 50%, 70%, 90%, and 100% keeps pitch behavior consistent with the selected mode.
A/B loop points can be moved during playback without UI drift or audio crashes.
Export backing track after muting one or more stems; output file opens in an external player.
Cancel a running separation job and start a new one without restarting the app.
Reopen a saved project and confirm stems, loop points, tempo, pitch, and mix state are preserved.

No license: community workflow works and professional-only actions explain the license requirement.
Valid online license: professional workflow unlocks stem separation, tempo/pitch controls, project save, and export.
Activated license state: app launches with no network and preserves licensed state.
Tampered or wrong-product license: app rejects the license without losing local projects.
No network: importing, playback, loops, saved projects, activated license state, and local exports still work.

No console panic or unhandled promise rejection during the full import -> separate -> slow -> loop -> export path.
Release notes mention any remaining stem quality, format, or performance limitation.
Screenshots and help copy match the current UI labels.